OK, as I mentioned in my paid module review: Auto Content Scraper does fine with importing YouTube videos, except that my thumbnails are all little gray "please wait" icons. This is because RSS data is being encoded in the URL.

My RSS Feed example was:
http://gdata.youtube.com/feeds/base/videos/-/NAMEOFSEARCHTAG

And the resulting thumbail tags were
http://www.youtube.com/watch?v=KRr_eopuvGU&feature=youtube_gdata/default.jpg

So, I edited the smarty template begin_scrape_summary.tpl to automatically strip &feature=youtube_gdata

Around Line 4 (original):
<a href="{$story_url}"><img src="http://img.youtube.com/vi/{$url|replace:'http://www.youtube.com/watch?v=':''|replace:'http://youtube.com/watch?v=':''}/default.jpg" border="0"></a>

Around Line 4 (modified):
<a href="{$story_url}"><img src="http://img.youtube.com/vi/{$url|replace:'http://www.youtube.com/watch?v=':''|replace:'http://youtube.com/watch?v=':''|replace:'&feature=youtube_gdata':''}/default.jpg" border="0"></a>